W. A. Norton on Ericsson’s Caloric Engine. 407 
TasBie II. 
Haine of ship. ec. Pratt, steam Htitee-piwik: ae Se Equiv: Ibe. Of anth; 
ibs. lbs. Ibs. 
Ericsson, ........ 6-4 300 187 
ak oi eee 6°83 to 6°9 248 2-26 
yee 10°38 600 
Humboldt, 20°5 2235 2°91 2°31 to 2°54 
SS Se ei 18°8 1607 3°82 
Washington, 169 911 3°66 2:56 
Fawkes 160 866 3°72 
ete b:0,9 21-7 1606 ; 2°80 
Eig Oa tek bie > 9 Ea g 1606 J 2°80 
pM ORAS .S 208 49 4:12 2°88 
Ppl, . 14:0 539 5:26 68 
Pardee sst i 19-0 2290 x 3:50 
ulton, (the third,)) 30-1 776 ee 2°93 
‘South America, . . 80°1 1104 9-15 
_In the two cases of the Arctic and Mississippi, the mean effec- 
tive cylinder pressure was obtained by an indicator. The results, 
given for the other steam ships would doubtless be nearer the 
exact truth if an additional allowance of from 1]b. to 2lbs. were 
made for the greater reaction of the partially condensed steam in 
the cylinder than in the condenser. If an allowance of 2 lbs, be 
made, on this account, we obtain the following result. 
2 : Tasie Il. 
: Name of ship. Effec. press. of st = p : gee - Equiv. Ibs. of anth. 
Ibs, Tbs. te 
dt oe. s.. 185 2017 3-22 2°65 to 2°82 
*, Ry cvs tees, 16-8 1436 427 2-99 safe 
ashington, ....] 15 862 415 2-90 
~ ae a 14 758 4:22 2-97 
PePast AY 19-7 1458 : nto 
» enas 19°7 1458 ‘ 
ca a 18:8 446 4°56 3:18 . 
hea 4g nS 140 539 526 : 1s 
Arctic, ek 19 2290 eae 
Fulton... ott} oga 727 pier ea AS 
America,..} 28-1 1036 cree 2-94 
The average consumption of anthracite coal by the several 
Steam ships named in the table is 3:11 Ibs. per horse-power per 
®d; then the gain in the expenditure of fuel, would be in the 
Tatio of 1 to 3-39. But we shall soon see, in another connection, 
that the comparison ought rather to be made with the numbers 
given in Table IL, If this be done, (omitting the results obtained 
for the ississippi and the Arctic, which correspond more nearly 
gabe Supposition made in Table IIL), we find the advantage in 
or of the Ericsson, in so far as it has hitherto shown its capa~ 
